[sanc.ti.fy] vt -fied ; -fy.ing [ME sanctifien, fr. MF sanctifier, fr. LL sanctificare, fr. L sanctus sacred--more at saint] (14c) 1: to set apart to a sacred purpose or to religious use: consecrate
2: to free from sin: purify 3 a: to impart or impute sacredness, inviolability, or respect to b: to give moral or social sanction to
4: to make productive of holiness or piety "observe the day of the sabbath, to ~ it --Deut 5:12 (DV)"